The local government advises people ________ to other places ________ it is not necessary during the pandemic.
travel; unless
to not travel; if
not to travel; unless
not to travel; if
Smoking is bad for your health. You should.
Aron water five days later.
This is______difficult problem that few students can work it out.
.He lives_______in the______village, but he is never_______.
Pollution is a serious problem. Scientists have _______ some good ways to save it.